One who does work after Shabbat will never see benefit from it: Pesachim 50b
Setting the table after Shabbat, even if one doesn't eat: Shabbat 119b
Hot liquids and warm bread after Shabbat are medicinal: Shabbat 119b
Banning use of items created by violating Shabbat, until such time has passed after Shabbat that the work could have been done after Shabbat: Eruvin 40a
